K Source Fit System 81300 Snap-on Black Towing Mirror for Toyota Tundra/Sequoia - Pair Snap over your vehicle's existing mirror for increased vision while towing No drilling or tools require for installation , An adjustment screw is on the on the back of the small mirror. It allows the user to tighten the mirror mount to reduce vibration. So versatile you can leave it on and fold with existing mirror for small spaces or just to protect the mirror, or easily remove for later use OEM fit and finish; looks like existing mirror Economical alternative for your towing needs